Comment formatting.
diff --git a/internal/ceres/conjugate_gradients_solver.cc b/internal/ceres/conjugate_gradients_solver.cc
index 1a7b5d8..71d49d5 100644
--- a/internal/ceres/conjugate_gradients_solver.cc
+++ b/internal/ceres/conjugate_gradients_solver.cc
@@ -198,13 +198,14 @@
// from Stephen Nash's work on truncated Newton
// methods. References:
//
- // 1. Stephen G. Nash & Ariela Sofer, Assessing A Search Direction
- // Within A Truncated Newton Method, Operation Research Letters
- // 9(1990) 219-221.
+ // 1. Stephen G. Nash & Ariela Sofer, Assessing A Search
+ // Direction Within A Truncated Newton Method, Operation
+ // Research Letters 9(1990) 219-221.
+ //
+ // 2. Stephen G. Nash, A Survey of Truncated Newton Methods,
+ // Journal of Computational and Applied Mathematics,
+ // 124(1-2), 45-59, 2000.
//
- // 2. Stephen G. Nash, A Survey of Truncated Newton Methods,
- // Journal of Computational and Applied Mathematics, 124(1-2),
- // 45-59, 2000.
double zeta = summary.num_iterations * (Q1 - Q0) / Q1;
VLOG(2) << "Q termination: zeta " << zeta
<< " " << per_solve_options.q_tolerance;
